OMRON Z4M sensor precision measurement

Possible cause: Electrical interference. Confirm whether the linear output shielding layer is single point grounded; Avoid wiring in the same cable tray as the power line; Check if the power ripple exceeds 10%.

Phenomenon 3: For metal or mirror targets, enable the output to remain ON even after the target is out of range.

This is caused by stray light generated by laser on strongly reflective surfaces. Solution: Adjust the sensor angle to make the specular reflection light deviate from the receiving lens; Or switch back to WHITE mode in AUTO mode to tighten the judgment threshold.

Phenomenon 4: The zero point offset is significant after replacing the target material.

The reflectivity and diffuse reflection characteristics of 780nm infrared light vary greatly among different materials. The offset calibration must be re executed according to Chapter 5. If there is frequent material replacement, it is recommended to use an external setting value storage and automatic loading mechanism.

Laser safety regulations and accessory usage

7.1 FDA/IEC Compliance Requirements

As a Class 3B/IIIb laser product, Z4M must meet the following safety measures:

Interlocking interface: Install interlocking switches on the system protective casing. When the access door is opened, the interlocking contacts will disconnect and the laser emission will immediately stop.

Laser emission indicator: The NEAR/FAR indicator light on the sensor doubles as a warning light (flashing green or constantly on) when the laser is turned on, and it must be ensured that the operator can still recognize it while wearing protective goggles.

Attenuator: The sensor has an inherent built-in attenuation mechanism (such as startup delay) that does not allow users to bypass it.

Label posting: Before use, the accompanying FDA warning label, aperture label, and certification mark must be securely affixed in a visible position on the sensor.

7.2 Z49-SF2 Laser Safety Kit

For applications that require comprehensive compliance with safety standards such as JIS C6802, the Z49-SF2 safety kit can be selected. This kit includes:

Controller: equipped with a key switch, interlocking terminals, and a green laser warning indicator light (also serving as a power indicator). The key switch directly controls the laser emission enable of the sensor.

Beam blocking cover: used to physically block the laser exit when the sensor is not in use.

Interlocking function logic: The controller provides two interlocking terminals (1 and 2). Short circuit at factory; When the external door lock switch is disconnected, regardless of the laser OFF input status, the laser cannot be emitted. If the laser OFF input line (orange) is short circuited to 0V (orange/purple), the laser will also be forcibly stopped. The green indicator light of the controller only lights up when the key is turned on, which does not necessarily mean that the laser will be emitted - the final emission needs to meet the requirements of interlock closure, laser OFF input open circuit, and sensor self preheating.

7.3 Cleaning and Maintenance

The cleaning of optical windows must be cautious: first, use air blowing (do not blow with your mouth) to remove floating dust; Then use a soft lens cloth dipped in anhydrous ethanol to rotate and wipe from the center outwards, without reciprocating friction, to avoid scratching the coating and causing measurement abnormalities. There are no user repairable components inside the sensor, and disassembly is strictly prohibited - disassembly will expose invisible laser radiation.

Application case: Integration with signal processor for measuring eccentricity

The use of Z4M in conjunction with K3TS signal processor can achieve automatic measurement of eccentricity of shaft components. System connection: Z4M linear output connected to K3TS analog input, with a range set to ± 9.999V; enable output connected to K3TS external trigger input. Calibration steps:

Align Z4M with the surface of the measured axis and adjust the distance so that the NEAR/FAR dual lights remain on (center point).

Rotate the spindle at low speed and observe the real-time display reading of K3TS. Using the scaling function of K3TS, correspond the -4V~+4V of the sensor to the actual displacement value (e.g. -10mm~+10mm).

Configure K3TS to "peak hold" mode and set a timed input (e.g. triggered by a button during each measurement cycle). The sensor will continuously collect the maximum and minimum values within one revolution.

Eccentricity=maximum value - minimum value. K3TS can directly output this difference.

Attention: For smooth chrome plated shaft surfaces, mirror reflection may cause misjudgment of the enable output. In this case, the sensor can be slightly tilted (angle ≤ 10 °) and the BLACK sensitivity level can be selected to measure using the diffuse reflection component.